Bug 1388145 - Move Services.logins initialization to nsBrowserGlue. r=MattN
This will move this code to a place that will run it once per session (as needed) and not once per window. It also better defines it to run after all sessionstore-windows-restored, instead of arbitrarly after 3 seconds.
MozReview-Commit-ID: h2WTd2zrSO

466b3af9e6572ad42f13176bbcd387f3b973a02f: Bug 1388145 - Make GMPInstallManager telemetry only run once per session (and not per window), and run it after an idle period. r=florian
draft

Bug 1388145 - Move the default browser check to an idle callback. r=florian
Note that the DefaultBrowserCheck.prompt() was scheduled with an idle callback before and it was removed here, because it's no longer necessary (as the entire function is now running from an idle callback)
MozReview-Commit-ID: ByDk0LzHpfg

Bug 1388145 - Move ContextualIdentityService and SafeBrowsing initialization to _scheduleStartupIdleTasks. r=florian
This has no change in behavior since they are already scheduled with idleDispatchToMainThread, but this puts them in the proper code location
MozReview-Commit-ID: IS5ZQjJy77q